Under Pd(II)/CuI cocatalysis, o-diarylphosphinophenylalkynes cyclize in boiling toluene via C–P bond cleavage and arylphosphination of the C≡C bond. This protocol provides an unprecedented atom- step-efficient access to optoelectronically biologically interesting benzophospholes.

Coordination of H-E (E = H, C, Si, etc.) σ-bonds to unsaturated element centers, forming η2-σ-complexes, is a crucial step in bond activations which are involved numerous chemical transformations. Structural characterization σ-complexes has provided invaluable insight into the σ-bond activation process. While η2-σ-complexes low-oxidation-state transition metals have been isolated and thoroughly studied, those based on d0 or high-oxidation-state main group elements still remain elusive,...

High-valent transition metal or main group complex mediated σ-bond metathesis plays an important role in the activation of covalent H–E bonds. However, its involvement C–C bonds has remained elusive. Here we describe direct hydroboration cyclopropanes by a hydroborenium complex. Our mechanism study suggests this reaction operates through pathway. With as catalyst, hydrogenolysis unfunctionalized was achieved, which is unprecedented for homogeneous catalysts and provides unconventional...

RATIONALE The study of interactions between protein and pharmaceutical molecules including natural extracts has become increasing interest in biological biomedical research. An investigation the interaction saikosaponins cytochrome c (Cyt c) by electrospray ionization mass spectrometry (ESI‐MS) is described this study. Saikosaponins are found Bupleurum falcatum (a flowering plant), they glycosides that consist saccharides sapogenins triterpenoids. METHODS Seven model triterpenes, namely...

The purpose of this research is to effectively classify medical data, provide accurate data foundation for clinical diagnosis and pathology, thereby improving the prediction discrimination diagnosis. Aiming at problem poor classification accuracy, caused by high-dimensional characteristics interclass imbalance factors in paper explore a imbalanced method based on random forest ensemble feature selection algorithm. A space distribution model constructed using phase reconstruction method....

AbstractAbstractThis paper describes some algebraic models for the automated generalization of area-patches. These are based on techniques developed in mathematical morphology, which is a science dealing with form and shapes objects, will an basis area-patch generalization. fully illustrated tested. The results show that such very promising.

Feature displacement is one of the many operations (or operators) in map-data generalization. It has become a priority item on research agenda. This paper describes some algebraic models mathematical models) for this operation. These are based operators developed morphology, which science dealing with form, shape, and structure objects. displacements can be classified into two groups, i.e., feature translation modification. For first type, set structuring elements (key morphological...

Abstract Electrospray ionization mass spectrometry (ESI‐MS) has been used to characterize the denaturation of porcine hemoglobin (Hb) induced by solvent changes. This work provides evidence for symmetric nature Hb and demonstrates that heme losses from α‐ β‐monomers occur in parallel, response addition acid organic co‐solvents solution. When subject one following solution conditions (pH 3.2–4.0 or 15–30% acetonitrile‐water 30–45% methanol‐water solution), β‐globins undergo dissociation...

For the graphic representation of spatial data (e.g. a map), if scale is reduced, then some area features will become too small to be represented, i.e. they need eliminated. This elimination procedure part so-called generalization process. paper describes techniques in digital map for this procedure, which employ several operators developed mathematical morphology, science shape, form and structure. The include three steps. These involve process reduce size every feature using an erosion...

The traditional measurement methods cannot adapt to the arduous topography of alpine-gorge area. Aiming at topographical features area, we will introduce a general terrestrial method multi-baseline photogrammetry basing on digital camera here, and then paper mainly studies metrization common matching image sequences Through camera, efficiency terrain data collection increase in requirements operations control algorithm reduce. combination seed points multiple constraints stereo help solve...

Application of expert systems is currently a fashionable topic in cartography. From the mid 1980s, researchers cartography have attempted to realize automation map design and production using systems. To develop systems, first step must be formalisation procedure, knowledge representation methods are basis formalisation. This paper aims present new method for design, i.e. Generalized Frame (GF). has been employed by MAPKEY—a thematic system, which used atlas. improves capacity so- called...

A foreground-focused action recognition algorithm based on convolutional neural network for intelligent unmanned systems is presented in this paper. The consists of the foreground extraction part and part. For which can be considered as an object detection task, a network-based single-shot model with spatial pyramid pooling structure Mish activation function developed to achieve better performance. part, Convolution-3D modified proposed applies 3D convolution kernel obtain temporospatial...

Abstract Benzophospholes are obtained by intramolecular cyclization reactions of phosphinophenylalkynes involving a C—P bond cleavage and arylphosphination the CC using Pd(OAc) 2 /CuI bimetallic catalyst system.

AbstractAbstractThis paper describes some algebraic models for the automated generalization of area-patches. These are based on techniques developed in mathematical morphology, which is a science dealing with form and shapes objects, will an basis area-patch generalization. fully illustrated tested. The results show that such very promising.